Basically, if you do have to use an Airport Base Station as a wifi router, you will be connecting it to the Bell Modem in what is refereed to as "Bridge Mode". Thanks to Apple's Network Utility software, setting this up is very easy and quite painless. It is as simple as logging into the Bell modem (Type 192.168.2.1 in your browser), disabling the wifi, turning off the DHCP leasing, turning off any firewall (if applicable), connecting the Airport to the Bell modem with an ethernet cable (WAN port on Airport to LAN port on Bell modem), then launching the Airport Utility and creating a wireless network. Under the "Internet" tab on the Airport Utility, you connect using PPPoe and under there you put the Bell account name you have been assigned (usually starts with b1) and the password you created with Bell for the service (this information is usually found on a card the tech will give you). After that it is quite easy to create a wireless network with the Airport, set security protocols, and give the Base Station a name and password.

I mean turn off the wireles on the Sagecom. Let id to the PPPoE. Connect the Airport to the Sagecom and turn al the router/firewall options on the Airport off. I dud tat with my DLink DIR-655. It is npow used strictly as a switch/WAP.